sorry my bad its the wrong one there is another link i cant remember it.. but heres what you have to do..you will have new drivers but old catalyst (but will be able to play opengl supported games

)
its pretty much the same thing as that guide
1. uninstall the other driver
2.download the
vista version of the lastest ati catalyst suite(download the radeon one not mobility).
extract but dont run the program...
3. download the dh mod tool and run it(go mobile) for the vista version
4.then open up the .inf file in notepad shuold be something like CX_41238.inf (inside you will know as it will have stuff like
"ATI MOBILITY RADEON" = ati2mtag_M6, PCI\VEN_1002&DEV_4C59
"ATI MOBILITY RADEON" = ati2mtag_M6, PCI\VEN_1002&DEV_4C5A
"ATI MOBILITY RADEON 7500" = ati2mtag_M7, PCI\VEN_1002&DEV_4C57
"ATI MOBILITY RADEON 7800 GL" = ati2mtag_M7, PCI\VEN_1002&DEV_4C58
"ATI MOBILITY RADEON 9000" = ati2mtag_M9, PCI\VEN_1002&DEV_4C66
"ATI MOBILITY RADEON 9000" = ati2mtag_M9, PCI\VEN_1002&DEV_4C65
etc )
on that particular section add this line at the end
"ATI Mobility Radeon X1900" = ati2mtag_M58, PCI\VEN_1002&DEV_7284
5.save file
- Right click on the desktop and open your display properties
- Go to Settings tab
- Click on Advanced
- Find your card properties (where you can see some informations about your card and list all the compatible display resolutions)
- Click the Properties button - Go on Driver tab
- Click on Update driver
- Windows ask if you want to check updates with windows update for your driver, choose "Not this time"
- Click Next
- Choose "Install from a specified location"
- Next
- Choose "Do not search. I will choose myself"
- Click on Disk
- Click on Browse
- Select the inf file that you modified just before :
- OK
- If all is fine, you should now see, with "Only show compatible hardware" checked, "ATI Mobility Radeon X1900 "
- Click on Next and follow the procedure until Windows ask you to reboot.
- Reboot when asked
and there you go
